On 22 July 2014 07:57, Bo Shen voice.shen@atmel.com wrote:
Hi Akshay,
On 07/17/2014 08:54 PM, Akshay Mishra wrote:
Hello, I am trying a simple alsa capture on the Atmel ARM9 (SAM9G45). While only capture runs fine, putting any os call on the same thread gives XRUNs.
Even a innocent usleep(1) seems to lead to regular XRUNs. Eventually I want to dump this capture on the serial port and I am not able to get past this.
Do you test with alsa utils. If yes, where you add the usleep(1) in code?
I have tried on AT91 linux as well as on kernel 3.10.10-rt7 with no
success.
I try both kernel and don't reproduce this issue with alsa utils.
Bo, I put usleep(x) after the snd_pcm_readi. I also tried with this code (attached). usleep at Line 88 gives the error.
Another observation is, disabling HRTimer the -EPIPE error was not seen but I need further tests to be sure about this behaviour.
The code is from here (http://www.linuxjournal.com/node/6735/print).
Please advice,
Akshay
Best Regards, Bo Shen